A permanent magnet for an MRI scanner is made by removing extraneous elements from an ore containing rare earth elements to leave elements Pr and Nd therein, and then selectively stripping therefrom a portion of the element Nd as a byproduct to leave an ore residuum including both elements Pr and Nd therein. The residuum is alloyed with a transition metal to form an alloy therewith. The alloy is then formed into a rare earth permanent magnet configured for use in the MRI scanner.

A cover for an earth boring tool having a canopy with opposite sides, opposite ends, a top portion, and a bottom portion. A plurality of straps are secured to one side of canopy, extend across the open bottom portion, and are detachably secured to the opposite side of the canopy. The end straps, when detachably secured, align with the edges of the opposite ends to form a temporary seal.

An apparatus for modifying the earth's surface by removing soil from the surface, moving the soil to a new location and filling low areas. It comprises a frame carried by at least two wheels, a tongue mounted to the frame for attachment to a tractor, a cutting blade mounted on the frame, and a bucket pivotally mounted to the frame adjacent the blade to receive the soil cut by the blade. The wheels are pivotally mounted to the frame for movement of the wheels about the back wall and floor of the ...

A revetment formed from orthogonally arrayed reinforcing rods secured together. A membrane is secured to the back side of the reinforcing rods to retain backfill compacted behind the revetment, or a vegetation ground cover may be planted on the exposed surface of the revetment to prevent erosion. Horizontal anchor rods secured to the revetment rods extend rearwardly therefrom and are embedded in the backfill to stabilize the revetment. Adjustable anchor rods allow tension to be selectively appli...

An earth-tremor-responsive light contained in a main housing is described having a back member for mounting against a vertical wall and a light transmitting front cover; a stand-by battery; a light emitter; electrical circuit elements connecting the battery to the light emitter through an inertial switch which is actuated by acceleration resulting from earth tremors, the inertial switch including a switch chamber having a generally horizontal shallow upwardly-facing conical surface with a centra...

An earth fault circuit breaker (10) for use in a circuit including an AC power supply and a load (11), which circuit breaker comprises a current-to-voltage converter (12) having two transformers for monitoring the current before and after flowing through the load, a leakage current/voltage detector (13A) for processing the outputs (E1 & E2) of the transformers to produce a resultant voltage, a voltage comparator (16) for comparing the said resultant voltage with a predetermined reference voltage...

An earth leakage breaker comprising a zero-phase-sequence current transformer for detecting a current difference on an AC line with respect to both positive (+) and negative (-) directions to sense an electric leakage of the AC line, a comparator for comparing an output voltage from the zero-phase-sequence current transformer with a trigger reference voltage, a delay for delaying the output voltage from the zero-phase-sequence current transformer by a desired period, a subtracter for subtracting...

A machine for pressing earth into blocks has a rectangular breech and a press foot vertically reciprocally drivable in the breech. A bucking block is horizontally reciprocally drivable into and out of registration with an open upper end of the breech. Portions of the upper surface of the bucking block are tapered upwardly from front to rear and a horizontal bucking bar extends across the breech and bears downwardly against the tapered upper portions of the bucking block when the bucking block is...

A vehicle is provided including a main frame structure, a track assembly mounted to the main frame structure and having an single, endless ground-engaging track extending in a longitudinal direction. A pair of steerable ground-engaging wheels flank the track, constructed and arranged to exert a ground bearing pressure sufficient to change a direction of travel of the track in response to turning of the wheels to steer the vehicle. Steering structure is operatively associated with the wheels to t...

An implement having a frame adapted to be transported in earth traversing movement along a predetermined path of travel; a first earth working tool mounted on the frame disposed for engagement with the earth during such earth traversing movement and operable to move earth laterally of the path of travel; a second earth working tool mounted on the frame forwardly of the first earth working tool relative to the path of travel disposed for engagement with the earth during the earth traversing movem...